Ernest nienstaedt



UNITED STATES PATENT OFFICE.

ERNEST NIENSTAEDT, OF NEW YORK, N. Y., ASSIGNOR TO THE APOLLO IN CANDESCENT GAS LIGHT COMPANY, OF SAME PLACE.

MANTLE OR HOOD FOR INCANDESCENT GAS-LIGHTS.

SPECIFICATION forming part of Letters Patent No. 581,364, dated April 2'7, 1897.

Application filed March 12, 1897. Serial No. 627,2l3- (No model.) I

To all whom it may concern.-

Be it known that I, ERNEST NIENSTAEDT, a citizen of the United States, and aresidentof New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Mantles or Hoods for Incandescent Gas-Lights, of which the following is a specification.

The mantles or hoods at present used with Bunsen gas-burners to produce an incandescent gas-light very often do not fully answer their purpose, as the light obtained by the incandescence of the chemicals or ingredients used in the mantles 0r hoods does not appear absolutely white and fades after a certain time or the mantles or hoods are so brittle that the utmost care is required to handle or ship the same.

The ob ect of my invention is to do away with these disadvantages by the appliance of a mixture of refractory earths in certain proportions and metal oxids, as stated hereinafter, which, by means of an added flux, are combined to a skeleton representing an incandescent body which radiates a perfectly white light, possesses a certain degree of firmness, will not shrink when heated, and keeps its lighting capacity for a considerably long time.

I have found by several tests that the mixture of certain refractory earths and metal oxids or nitrates as used in incandescent mantles or hoods for gas-burners obtains a greater, capacity of incandescence by the addition of a small quantity of rhodium and bismuth and that mixtures composed of the ingredients in the proportions mentioned hereinafter possess a high degree of consistency. I have found out that to obtain the results the following mixture is the best: 0.5 part of nitrate of zirconium, ten parts of nitrate of lanthanum, ten parts of nitrate of yttrium, 0.3 part of nitrateof magnesia, 1.4 parts of nitrate of cerium, seventy-five parts of nitrate of thorium, 0.3 part of nitrate of rhodium, one part of nitrate of bismuth, one part of nitrate of tin, and 0.5 part of boracic acid. These ingredients are dissolved in hot Water in the proportion of twenty to twenty-five to one hundred and stirred to prevent the loss of possible precipitates. The mantle or hood, consisting of a textile fabric, is then soaked with the thus-obtained solution, so that the same is entirely impregnated with the solution and the latter is deposited in the capillary tubes of the fabric, the precipitates of the solution adhering in and on the capillary tubes after the Watery parts of the mixture are evaporated. When the mantle is dried, the organic substances of the same is burned out and a skeleton composed of oxids of the said refractory earths and metals is obtained, which, in connection with the flame of a Bunsen burner, radiates an entirely White light. This skeleton possesses a comparatively high degree of consistency caused by the boracic acid serving as a strengthening-flux and will last for a considerably long time.

What I claim as new is- 1. A composition for incandescing mantles or hoods, the same consisting of nitrate of zirconium, nitrate of lanthanum, nitrate of yttrium, nitrate of magnesia, nitrate of cerium, nitrate of thorium, nitrate of rhodium, nitrate of bismuth, nitrate of tin, and boracic acid, in the proportions set forth.

2. A compound for an incandescing mantle or hood including nitrate of rhodium, nitrate of bismuth and boracic acid, substantially as described.

3. As an article of manufacture a burned mantle or hood, containing nitrate of rhodium, nitrate of bismuth and boracic acid as compound parts among certain refractory earths, substantially as set forth.

Signed at New York, in the county of New York and State of New York, this 4th day of March, A. D. 1.897.

ERNEST NIENSTAEDT. 

